INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - EXTENDED COMMANDS AX = C206h BH = subfunction 00h return device status Return: BL = pointing device status (see #00524) CL = resolution (see #00523) DL = sample rate, reports per second 01h set scaling at 1:1 02h set scaling at 2:1 Return: CF set on error AH = status (see #00522)